I really wish Fireworks or some image editor was designed for asset creation first and took care of these kinds of issues. Even with Fireworks if you zoom in on the palette and draw a box you can end up creating it on the half pixel and get anti aliasing issues. I want a tool that restricts you to whole pixels for everything, including when it does automatic resizing.
Can you clarify your issue with Fireworks? By "palette" do you mean "canvas"? From my experience, there are no sub-pixels initially on the edges of boxes drawn in Fireworks. Sub-pixels will occur if you use the Scale tool (Q) to resize the box, however you may subsequently snap the box to full pixels using Cmd+K. Also, if you resize the box using the X/Y dimension inputs in the Properties inspector, the edges will remain at full pixels.
Here you go, I created a box, zoomed in, and resized it using my cursor. http://i.imgur.com/Nx0Bx.png The pixel dimensions show whole numbers. Punching in numbers into the properties inspector isn't always an option, for instance when you're trying to resize a box with rounded corners while preserving the corner radius.
I see, so it's after you've created the box. I agree that there should at least be a mode where everything snaps to a full pixel. Anyhow, the Cmd+K trick would be useful in your case. Also, corner radii should be preserved if you resize with the properties inspector.
